diff --git a/hbase-hbck2/src/main/java/org/apache/hbase/HBCK2.java b/hbase-hbck2/src/main/java/org/apache/hbase/HBCK2.java
index 87b20b4..932f39a 100644
--- a/hbase-hbck2/src/main/java/org/apache/hbase/HBCK2.java
+++ b/hbase-hbck2/src/main/java/org/apache/hbase/HBCK2.java
@@ -99,6 +99,7 @@
   private static final String VERSION = "version";
   private static final String SET_REGION_STATE = "setRegionState";
   private static final String SCHEDULE_RECOVERIES = "scheduleRecoveries";
+  private static final String RECOVER_UNKNOWN = "recoverUnknown";
   private static final String GENERATE_TABLE_INFO = "generateMissingTableDescriptorFile";
   private static final String FIX_META = "fixMeta";
   // TODO update this map in case of the name of a method changes in Hbck interface
@@ -109,7 +110,9 @@
               put(SET_TABLE_STATE, Arrays.asList("setTableStateInMeta"));
               put(BYPASS, Arrays.asList("bypassProcedure"));
               put(SCHEDULE_RECOVERIES, Arrays.asList("scheduleServerCrashProcedure",
-                      "scheduleServerCrashProcedures")); }});
+                      "scheduleServerCrashProcedures"));
+              put(RECOVER_UNKNOWN, Arrays.asList("scheduleSCPsForUnknownServers"));
+            }});
 
   private static final String ADD_MISSING_REGIONS_IN_META_FOR_TABLES =
     "addFsRegionsMissingInMeta";
@@ -384,6 +387,10 @@
     return hbck.scheduleServerCrashProcedure(serverNames);
   }
 
+  List<Long> recoverUnknown(Hbck hbck) throws IOException {
+    return hbck.scheduleSCPsForUnknownServers();
+  }
+
   private HBaseProtos.ServerName parseServerName(String serverName) {
     ServerName sn = ServerName.parseServerName(serverName);
     return HBaseProtos.ServerName.newBuilder().setHostName(sn.getHostname()).
@@ -430,6 +437,8 @@
     writer.println();
     usageScheduleRecoveries(writer);
     writer.println();
+    usageRecoverUnknown(writer);
+    writer.println();
     usageUnassigns(writer);
     writer.println();
     writer.close();
@@ -659,6 +668,16 @@
     writer.println("   Command support added in hbase versions 2.0.3, 2.1.2, 2.2.0 or newer.");
   }
 
+  private static void usageRecoverUnknown(PrintWriter writer) {
+    writer.println(" " + RECOVER_UNKNOWN);
+    writer.println("   Schedule ServerCrashProcedure(SCP) for RegionServers that are reported");
+    writer.println("   as unknown.");
+    writer.println("   Returns the pid(s) of the created ServerCrashProcedure(s) or -1 if");
+    writer.println("   no procedure created (see master logs for why not).");
+    writer.println("   Command support added in hbase versions 2.2.7, 2.3.5, 2.4.3,");
+    writer.println("     2.5.0 or newer.");
+  }
+
   private static void usageUnassigns(PrintWriter writer) {
     writer.println(" " + UNASSIGNS + " <ENCODED_REGIONNAME>...");
     writer.println("   Options:");
@@ -894,6 +913,17 @@
         }
         break;
 
+      case RECOVER_UNKNOWN:
+        if (commands.length > 1) {
+          showErrorMessage(command + " doesn't take any arguments");
+          return EXIT_FAILURE;
+        }
+        try (ClusterConnection connection = connect(); Hbck hbck = connection.getHbck()) {
+          checkFunctionSupported(connection, command);
+          System.out.println(toString(recoverUnknown(hbck)));
+        }
+        break;
+
       case FIX_META:
         if (commands.length > 1) {
           showErrorMessage(command + " doesn't take any arguments");
diff --git a/hbase-hbck2/src/test/java/org/apache/hbase/TestRecoverUnknown.java b/hbase-hbck2/src/test/java/org/apache/hbase/TestRecoverUnknown.java
new file mode 100644
index 0000000..debfba1
--- /dev/null
+++ b/hbase-hbck2/src/test/java/org/apache/hbase/TestRecoverUnknown.java
@@ -0,0 +1,66 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hbase;
+
+import static org.junit.Assert.assertEquals;
+
+import java.io.IOException;
+import java.util.List;
+
+import org.apache.hadoop.hbase.HBaseTestingUtility;
+import org.apache.hadoop.hbase.client.ClusterConnection;
+import org.apache.hadoop.hbase.client.Hbck;
+import org.junit.AfterClass;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TestName;
+
+
+public class TestRecoverUnknown {
+  private final static HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
+  private HBCK2 hbck2;
+
+  @Rule
+  public TestName name = new TestName();
+
+  @BeforeClass
+  public static void beforeClass() throws Exception {
+    TEST_UTIL.startMiniCluster(2);
+  }
+
+  @AfterClass
+  public static void afterClass() throws Exception {
+    TEST_UTIL.shutdownMiniCluster();
+  }
+
+  @Before
+  public void before() {
+    this.hbck2 = new HBCK2(TEST_UTIL.getConfiguration());
+  }
+
+  @Test
+  public void testKnownServersNotRecovered() throws IOException {
+    try (ClusterConnection connection = this.hbck2.connect(); Hbck hbck = connection.getHbck()) {
+      List<Long> pids = this.hbck2.recoverUnknown(hbck);
+      assertEquals(0, pids.size());
+    }
+  }
+
+}
diff --git a/pom.xml b/pom.xml
index 3b5a64b..529c828 100644
--- a/pom.xml
+++ b/pom.xml
@@ -128,7 +128,7 @@
     <compileSource>1.8</compileSource>
     <java.min.version>${compileSource}</java.min.version>
     <maven.min.version>3.3.3</maven.min.version>
-    <hbase.version>2.1.6</hbase.version>
+    <hbase.version>2.2.7</hbase.version>
     <surefire.provider>surefire-junit47</surefire.provider>
     <test.output.tofile>true</test.output.tofile>
     <checkstyle.version>8.18</checkstyle.version>